Grinding apparatus



Dec. 21 1926. 1,611,747v s. B. Hr-:PPENSTALL GRI NDI NG APPARATUS Filed De. 2,` 192.,

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. nular recess, channel or 4trough 12 whose Patented Dec. 2l, 19.26.

`UNITED sTATEs PATENT OFFICE.

SAMUEL n. HErrENsTALL, or

PITTSBURGH, PENNSYLVANIA, ASSIGNOB T HEP- PENSTALL FORGE AN D KNIFE COMPANY, OF PITTSBURGH, PENNSYLVANIA, .A COB- POBATION `F PENNSYLVANIA.

GRINDING Arranrus.

Application inea December 2, 1,9114. smal No. 'Mamal My invention relates to grinding .apparatus, and more particularly to grinding cylinders equipped with supporting and safety banding means.

The principal object of this invention 1s to supply an improved type of supportin or safety banding for grinding-cylm ers, whether the cylinders are in one or more pieces. lt is diiiicult, if not iniposslble with banding of the mechanical or clampty to secure accurate and intimate contact etween the bandinf and the abrasive material of which the cylinders are con'iposed.- The ditiiculty is particularly great wlth cylinders composed ot a circular series of segments. ln cases of mechanical or clamp banding, the results are uncertain owing in part to the degree ot skill exercised by the workmen who apply the bands. time is lost in adjusting the bands.

Another object of my invention is to provide for an improved mounting of the grindino cylinder' on the arbor oil-'rotary shaft.

eterring to the accompanylng drawing,

" Fig. l is an end elevation of a grinding cylinderequipped with my invention; Fig, 2, a section onthe line Il--H of Fig. 1, parts being broken away; Fig. 3, an enlarged broken and sectional view of a fragment taken :from the side of the grinding cylinder l showing one of the bands; Fig. il, an enlarged broken view taken in sectionalongthe line lV-IV in'Fig. 1, and Fig. 5, an enlarged broken View showing a portion of one of the bands and intermediate clips.

` Un the drawings, l designates the spindle or arbor of a grinding machine supported and driven by any suitable means. The arbor has the reduced end 2 which projects through the hub 3 and has its outer end d threaded and provided with the nut 5 which clamps the hub between the said nut and the shoulder 6 on the arbor. The hub has the peripheral flange 7 which overlies the rear face ofthe chuck or holder ringv 8, lag screws or bolts 9 being passed through the said flange and into the said ring to ri idly connect the hub and the ring toget er. The hub is lprovided with' a circular concentric portion 10 which lits into the annular axial opening 11 of the holder ring 8.

The face of the ring opposite the face to which the hub 3 is attached has the an- Furtherinore muchl lpreferably to the outer the continuous turns of wire .intermediate cllps 19.V

lateral walls are preferably provided with annular grooves 13`to alford anchora for cementitious material 14 depositedv 1n the The cylinder is shown composed of an n annular series of segments 16 separated. at their bases by the cementitious material 1st which is continuous with the cementitious material at the inner and outer faoeslof the segments or cylinders but extends outwardly face of the channel For banding or supporting from without the cylinder l5, l provide one or more bands 18, each comprising several turns of wire wound in a helical manner with the successive turns of each band contiguous. Both ends of the wire in each band are held in place by a metal clip 19 enclosing the band,

the ends of the clip being soldered or otherwise connected together. The ends 17 of the wire in each band extend beyond the clips and these ends are bent away from the band close to the clip to prevent any possibility of the ends escaping from the clip. To hold the turns of wire, which form a band, snugly together and in place, l prefer to provlde additional clips 19 which are spaced around the band. The diameter of the band is somewhat larger than the external diameter of the cylinder 15 in order to provide a space between the band and the cylinder for cementitious material, as will be explained.

The bands 18 are formed by winding the wire on a suitable mandrel and securing the ends of the wire by means of the clips l?) and together by the The bands thus formed are preferably of proper diameter to fit the cylinder' loosely.

The cylinder is then positioned with its axis vertical and the free ends of the segments uppermost. The spaces between contiguous segments Iare then closed at their llatter are in place.

A dam 21 com osed of clay or the equivalent is then laid) on the top outer wall ot the channel 12 and the lirst band 18 is placed on this dam 21. The cementitious material 22 is then introduced into the said space between the band and the cylinder up to the level of the top of the band 18. A second,

annular dam 23 of clay or the like is then placed on the first band 18., and the second ring 18 is placed on this dam. The cementitious material 22 is poured into the space between the cylinder and the second band.`

A third dani 24 is placed on the second band 18 and the third band is placed thereon, and cementitious material 22 is again ured into the space between the`cylinder and the third band. When the cementitious material 22 has hardened the clay dams 20, 2l, 23, 24 are then knocked away, and the cylinderris ready for use.

Additional bands may, if required, be applied in the same manner, the free end portion of the cylinder being left without any banding so that its free end may be used for grinding. When the free end of the cylinder has been worn away to the line where the outer band 18 interferes with grinding, the latter is cut and removed. Each band is removed only as it becomes` necessary to expose another length of the cylinder by reason of the Wearing away 0l its outer end down to each band.

In the drawings I have shown a plurality of bands, but it will be understood that one or any number of bands, as may be considered preferable, may be employed.

The hubi 3 may be integral with the ring 8, but it is advantageous to make the ring 'animer separable from the hub as it enablesV the ready removal of the ring whose cylinder has been `Worn to its limit and the immediate and easy substitution of a ring which has been refilled or iitted with a new abrasive cylinder.

rl'he banding is preferably' composed of steel wire, preferably copper coated so as to resist the action of rust. However ythe band-V ing may be either a continuous piece ol metal of preferred shape of cross-section, or a series of such pieces riveted or welded in a manner similar to that used in making ordinary hoops for barrels, kegs and the I like.

I claim- 1. In a grinding apparatus, an arbor, a holder secured thereto and rotatable coaxially therewith, a grindin cylinder secured to4 the holder and rotatab e coaxially with the holder, metallic banding surrounding the cylinder and 'spaced therefrom, and cementitious material connecting the banding and the cylinder, the banding being composedof a. helically-wound length of metal.

2.` 1n a grinding apparatus of the character described, t-he combination with a rotate able holder having an annular recess in its tace and a grinding cylinder comprising a plurality of segments arranged in annular series and having their butt-ends seated and secured in said recess, 'of a metal banding for said segments surrounding said segments and independent of said holder, said v 

